SBH21-M-500/10-NX2 - TAIXUANTECH

SBH21-M-500/10-NX2 Three-Phase Two-Winding Oil-Immersed Amorphous Alloy Core Off-Circuit Tap-Changer Distribution Transformer

10kV Oil-Immersed Amorphous Alloy Distribution Transformer Series

SBH21-M-500/10-NX2 Three-Phase Two-Winding Oil-Immersed Amorphous Alloy Core Off-Circuit Tap-Changer Distribution Transformer

The SBH21-M-500/10-NX2 is a three-phase, two-winding oil-immersed distribution transformer with a fully sealed corrugated tank, an amorphous alloy core, and an off-circuit tap changer, rated at 500kVA and 10kV on the high-voltage side. Designed to meet Class 2 energy efficiency (NX2) under GB 20052-2024, its amorphous alloy core delivers exceptionally low no-load loss, making it a mainstream choice for energy-efficient distribution networks. The transformer features a fully sealed corrugated tank structure that isolates the transformer oil from air, slowing down insulation aging and enabling maintenance-free operation. The amorphous alloy core is made of high-quality ultra-thin alloy strips with a wound core structure, three-phase five-column type. Low-voltage windings use oxygen-free copper conductors, ensuring low partial discharge, low temperature rise, and strong short-circuit withstand capability. Vacuum oil filling ensures stable insulation performance. Typical applications include utility distribution networks, industrial facilities, commercial buildings, residential developments, and renewable energy projects where high efficiency and reliable power supply are essential.

Industrial & Commercial Renewable Energy Utility & Grid

Rated Capacity: 500 kVA
Rated Voltage Ratio: 10/0.4 kV
Connection Group: Dyn11
Cooling Method: ONAN
Energy Efficiency Class: NX2
Standard：IEC 60076, GB/T 25446-2010

Product Details

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Product Model SBH21-M-500/10-NX2

No-Load Loss ≤0.24 kW

Rated Capacity 500 kVA

No-Load Current ≤0.5%

Phase Three-phase

Load Loss (120°C) ≤4.625 kW

Rated Voltage Ratio 10/0.4 kV

Short-Circuit Impedance 4%

HV Tapping Range ±5%

Temperature Rise Limit Top oil ≤55K, Winding ≤65K

Rated Frequency 50 Hz

Noise (Sound Pressure Level) ≤55 dB(A)

Connection Group Dyn11

Protection Degree IP65

Cooling Method ONAN

Standard IEC 60076, GB/T 25446-2010

Insulation Class A, LI75 AC35 / AC5

Energy Efficiency Class NX2

01.

Core advantages

Class 2 Energy Efficiency (NX2)

Complies with GB 20052-2024 Class 2 energy efficiency standard. The amorphous alloy core reduces no-load loss by approximately 70–80% compared with conventional silicon steel transformers, and no-load current by approximately 90% (only 1/10 of silicon steel). This advantage is most pronounced in continuous light-load applications such as rural distribution networks and residential areas. Actual measured losses are typically lower than reference values, and detailed test data can be provided upon request.

Fully Sealed Structure

The transformer adopts a fully sealed corrugated tank structure with vacuum oil filling, which isolates the transformer oil from air and prevents oxidation and moisture ingress. This design requires no routine maintenance, effectively extending the transformer's service life and reducing operational costs.

Low Noise & Strong Short-Circuit Withstand

The amorphous alloy core's magnetostriction effect is smaller than that of silicon steel, resulting in 5–10dB lower noise than conventional transformers. Low-voltage foil-wound windings provide strong short-circuit withstand capability. The transformer maintains stable operation under continuous load with low temperature rise and high reliability.

02.

Application scenarios

No data was found

01.

Authoritative Certification

Our transformers are CE certified, ensuring full compliance with EU safety, health, and environmental standards.

Our transformers are UL certified, confirming they meet rigorous ANSI/IEEE safety standards for North American market entry.

ASTA

Our transformers have obtained ASTA type-test certification, verifying IEC 60076 compliance.

EAC

Our transformers are EAC certified, ensuring compliance with safety and EMC regulations for the Eurasian market.

SASO

We provide SASO-compliant transformers and assist clients in obtaining the Batch Certificate of Conformity (CoC) through the SABER platform.

02.

Quality Assurance

Partner Factory Audit

Regular on-site audits of partner factories to verify ISO, CE, and UL certifications.

Full-Process Quality Control

From raw material inspection to pre-shipment final inspection, every unit is checked against specifications.

Comprehensive Test Reports

Each transformer includes a detailed factory test report. 100% full inspection before dispatch.

Third-Party Inspection Support

SGS, BV, or other accredited third-party inspection available upon customer request.

01.

Technical Documents

No data was found

02.

Certification Materials

No data was found

10kV Oil-Immersed Amorphous Alloy Distribution Transformer Series – Full Specifications

10kV, 3-phase, 2-winding, oil-immersed, amorphous alloy core, off-circuit tap-changer, distribution transformer, 30-2500kVA
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	LV (kV)	Vector Group	No-Load Loss (kW)	Load Loss (kW)	Impedance Voltage (%)
SBH15-M-30/10-NX3	30	10，10.5，11	±5%	0.4	Dyn11	0.033	0.630	4
SBH21-M-30/10-NX2	30	10，10.5，11	±5%	0.4	Dyn11	0.033	0.535	4
SBH25-M-30/10-NX1	30	10，10.5，11	±5%	0.4	Dyn11	0.025	0.510	4
SBH15-M-50/10-NX3	50	10，10.5，11	±5%	0.4	Dyn11	0.043	0.910	4
SBH21-M-50/10-NX2	50	10，10.5，11	±5%	0.4	Dyn11	0.043	0.780	4
SBH25-M-50/10-NX1	50	10，10.5，11	±5%	0.4	Dyn11	0.035	0.735	4
SBH15-M-63/10-NX3	63	10，10.5，11	±5%	0.4	Dyn11	0.050	1.090	4
SBH21-M-63/10-NX2	63	10，10.5，11	±5%	0.4	Dyn11	0.050	0.930	4
SBH25-M-63/10-NX1	63	10，10.5，11	±5%	0.4	Dyn11	0.040	0.880	4
SBH15-M-80/10-NX3	80	10，10.5，11	±5%	0.4	Dyn11	0.060	1.310	4
SBH21-M-80/10-NX2	80	10，10.5，11	±5%	0.4	Dyn11	0.060	1.120	4
SBH25-M-80/10-NX1	80	10，10.5，11	±5%	0.4	Dyn11	0.050	1.060	4
SBH15-M-100/10-NX3	100	10，10.5，11	±5%	0.4	Dyn11	0.075	1.580	4
SBH21-M-100/10-NX2	100	10，10.5，11	±5%	0.4	Dyn11	0.075	1.350	4
SBH25-M-100/10-NX1	100	10，10.5，11	±5%	0.4	Dyn11	0.060	1.270	4
SBH15-M-125/10-NX3	125	10，10.5，11	±5%	0.4	Dyn11	0.085	1.890	4
SBH21-M-125/10-NX2	125	10，10.5，11	±5%	0.4	Dyn11	0.085	1.615	4
SBH25-M-125/10-NX1	125	10，10.5，11	±5%	0.4	Dyn11	0.070	1.530	4
SBH15-M-160/10-NX3	160	10，10.5，11	±5%	0.4	Dyn11	0.100	2.310	4
SBH21-M-160/10-NX2	160	10，10.5，11	±5%	0.4	Dyn11	0.100	1.975	4
SBH25-M-160/10-NX1	160	10，10.5，11	±5%	0.4	Dyn11	0.080	1.870	4
SBH15-M-200/10-NX3	200	10，10.5，11	±5%	0.4	Dyn11	0.120	2.730	4
SBH21-M-200/10-NX2	200	10，10.5，11	±5%	0.4	Dyn11	0.120	2.330	4
SBH25-M-200/10-NX1	200	10，10.5，11	±5%	0.4	Dyn11	0.095	2.210	4
SBH15-M-250/10-NX3	250	10，10.5，11	±5%	0.4	Dyn11	0.140	3.200	4
SBH21-M-250/10-NX2	250	10，10.5，11	±5%	0.4	Dyn11	0.140	2.735	4
SBH25-M-250/10-NX1	250	10，10.5，11	±5%	0.4	Dyn11	0.110	2.590	4
SBH15-M-315/10-NX3	315	10，10.5，11	±5%	0.4	Dyn11	0.170	3.830	4
SBH21-M-315/10-NX2	315	10，10.5，11	±5%	0.4	Dyn11	0.170	3.275	4
SBH25-M-315/10-NX1	315	10，10.5，11	±5%	0.4	Dyn11	0.135	3.100	4
SBH15-M-400/10-NX3	400	10，10.5，11	±5%	0.4	Dyn11	0.200	4.520	4
SBH21-M-400/10-NX2	400	10，10.5，11	±5%	0.4	Dyn11	0.200	3.865	4
SBH25-M-400/10-NX1	400	10，10.5，11	±5%	0.4	Dyn11	0.160	3.660	4
SBH15-M-500/10-NX3	500	10，10.5，11	±5%	0.4	Dyn11	0.240	5.410	4
SBH21-M-500/10-NX2	500	10，10.5，11	±5%	0.4	Dyn11	0.240	4.625	4
SBH25-M-500/10-NX1	500	10，10.5，11	±5%	0.4	Dyn11	0.190	4.380	4
SBH15-M-630/10-NX3	630	10，10.5，11	±5%	0.4	Dyn11	0.320	6.200	4.5
SBH21-M-630/10-NX2	630	10，10.5，11	±5%	0.4	Dyn11	0.320	5.300	4.5
SBH25-M-630/10-NX1	630	10，10.5，11	±5%	0.4	Dyn11	0.250	5.020	4.5
SBH15-M-800/10-NX3	800	10，10.5，11	±5%	0.4	Dyn11	0.380	7.500	4.5
SBH21-M-800/10-NX2	800	10，10.5，11	±5%	0.4	Dyn11	0.380	6.415	4.5
SBH25-M-800/10-NX1	800	10，10.5，11	±5%	0.4	Dyn11	0.300	6.075	4.5
SBH15-M-1000/10-NX3	1000	10，10.5，11	±5%	0.4	Dyn11	0.450	10.300	4.5
SBH21-M-1000/10-NX2	1000	10，10.5，11	±5%	0.4	Dyn11	0.450	8.800	4.5
SBH25-M-1000/10-NX1	1000	10，10.5，11	±5%	0.4	Dyn11	0.360	8.340	4.5
SBH15-M-1250/10-NX3	1250	10，10.5，11	±5%	0.4	Dyn11	0.530	12.000	4.5
SBH21-M-1250/10-NX2	1250	10，10.5，11	±5%	0.4	Dyn11	0.530	10.260	4.5
SBH25-M-1250/10-NX1	1250	10，10.5，11	±5%	0.4	Dyn11	0.425	9.720	4.5
SBH15-M-1600/10-NX3	1600	10，10.5，11	±5%	0.4	Dyn11	0.630	14.500	4.5
SBH21-M-1600/10-NX2	1600	10，10.5，11	±5%	0.4	Dyn11	0.630	12.400	4.5
SBH25-M-1600/10-NX1	1600	10，10.5，11	±5%	0.4	Dyn11	0.500	11.745	4.5
SBH15-M-2000/10-NX3	2000	10，10.5，11	±5%	0.4	Dyn11	0.720	18.300	5
SBH21-M-2000/10-NX2	2000	10，10.5，11	±5%	0.4	Dyn11	0.710	14.800	5
SBH25-M-2000/10-NX1	2000	10，10.5，11	±5%	0.4	Dyn11	0.550	14.000	5
SBH15-M-2500/10-NX3	2500	10，10.5，11	±5%	0.4	Dyn11	0.865	21.200	5
SBH21-M-2500/10-NX2	2500	10，10.5，11	±5%	0.4	Dyn11	0.860	17.150	5
SBH25-M-2500/10-NX1	2500	10，10.5，11	±5%	0.4	Dyn11	0.670	16.230	5
Note： 1.Tapping range options: ±5% or ±2×2.5%. ±5% is shown as default in this table. Other tapping ranges are available upon request. 2.Other high and low voltages are available upon request. 3.Vector group options: Dyn11 or Yyn0. Other vector groups are available upon request. 4.Efficiency classes (NX1/NX2/NX3) are in accordance with GB 20052-2024, corresponding to loss level codes SBH25, SBH21, and SBH15 respectively. 5.For IEC, ANSI, or other standards, or special frequency requirements, please contact us for a customized datasheet.

* For specific product requests, please Contact Us for customized solutions to your needs.

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SBH21-M-500/10-NX2 Three-Phase Two-Winding Oil-Immersed Amorphous Alloy Core Off-Circuit Tap-Changer Distribution Transformer

10kV Oil-Immersed Amorphous Alloy Distribution Transformer Series

SBH21-M-500/10-NX2 Three-Phase Two-Winding Oil-Immersed Amorphous Alloy Core Off-Circuit Tap-Changer Distribution Transformer